/Engine/Source/Runtime/Slate/Public/Framework/Notifications/NotificationManager.h
Sets the progress notification handler for the current application. Only one handler is used at a time. This handler is not managed in any way. If your handler is being destroyed call SetProgressNotificationHandler(nullptr)Sets the progress notification handler for the current application. Only one handler is used at a time. This handler is not managed in any way. If your handler is being destroyed call SetProgressNotificationHandler(nullptr)
void SetProgressNotificationHandler ( [IProgressNotificationHandler](API\Runtime\Slate\Framework\Notifications\IProgressNotificationHandler) * NewHandler )